Which of the following is NOT a method of determining minimum balance for interest earning?

In the context of determining minimum balance for interest earnings, the service charge method is not typically classified as a method for this purpose. Instead, it pertains to how fees are assessed on accounts rather than how balances are calculated for interest accrual.

The daily balance method calculates interest based on the balance in the account at the end of each day. This approach is straightforward and allows for precise interest calculations based on daily account activity.

The average daily balance method averages the balances in the account over a specified period, typically a month. This method smooths out daily fluctuations and gives a more stable measure of the account's performance regarding interest accrual.

The daily periodic rate method, while somewhat related to calculating interest, typically refers to how interest is applied on a daily basis based on the annual percentage yield but is not a standalone method for determining minimum balance for interest earning.

Thus, the service charge method differs fundamentally from the methods that directly relate to calculating minimum balances for earning interest.